Fall back to the normal DB when nothing is special

Signed-off-by: Joas Schilling <coding@schilljs.com>

lib/AppInfo/Application.php

@@ -45,6 +45,7 @@
 use OCP\AppFramework\Bootstrap\IRegistrationContext;
 use OCP\IConfig;
 use OCP\IDateTimeFormatter;
+use OCP\IDBConnection;
 use OCP\ILogger;
 use OCP\IURLGenerator;
 use OCP\IUserManager;
@@ -78,6 +79,18 @@ public function register(IRegistrationContext $context): void {
 		});
 
 		$context->registerService('ActivityConnectionAdapter', function (ContainerInterface $c) {
+			$systemConfig = $c->get(SystemConfig::class);
+			$configPrefix = 'activity_';
+
+			if ($systemConfig->getValue($configPrefix . 'dbuser', null) === null &&
+				$systemConfig->getValue($configPrefix . 'dbpassword', null) === null &&
+				$systemConfig->getValue($configPrefix . 'dbname', null) === null &&
+				$systemConfig->getValue($configPrefix . 'dbhost', null) === null &&
+				$systemConfig->getValue($configPrefix . 'dbport', null) === null &&
+				$systemConfig->getValue($configPrefix . 'dbdriveroptions', null) === null) {
+				return $c->get(IDBConnection::class);
+			}
+
 			return new ConnectionAdapter(
 				$c->get('ActivityDBConnection')
 			);